<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Cache
 * @subpackage Zend_Cache_Backend
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Disk.php 18951 2009-11-12 16:26:19Z alexander $
 */


/** @see Zend_Cache_Backend_Interface */
require_once 'Zend/Cache/Backend/Interface.php';

/** @see Zend_Cache_Backend_ZendServer */
require_once 'Zend/Cache/Backend/ZendServer.php';


/**
 * @package    Zend_Cache
 * @subpackage Zend_Cache_Backend
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Cache_Backend_ZendServer_Disk extends Zend_Cache_Backend_ZendServer implements Zend_Cache_Backend_Interface
{
	/**
	 * Constructor
	 *
	 * @param  array $options associative array of options
	 * @throws Zend_Cache_Exception
	 */
	public function __construct(array $options = array())
	{
		if (!function_exists('zend_disk_cache_store')) {
			Zend_Cache::throwException('Zend_Cache_ZendServer_Disk backend has to be used within Zend Server environment.');
		}
		parent::__construct($options);
	}

	/**
	 * Store data
	 *
	 * @param mixed  $data        Object to store
	 * @param string $id          Cache id
	 * @param int    $timeToLive  Time to live in seconds
	 * @return boolean true if no problem
	 */
	protected function _store($data, $id, $timeToLive)
	{
		if (zend_disk_cache_store($this->_options['namespace'] . '::' . $id,
		$data,
		$timeToLive) === false) {
			$this->_log('Store operation failed.');
			return false;
		}
		return true;
	}

	/**
	 * Fetch data
	 *
	 * @param string $id          Cache id
	 */
	protected function _fetch($id)
	{
		return zend_disk_cache_fetch($this->_options['namespace'] . '::' . $id);
	}

	/**
	 * Unset data
	 *
	 * @param string $id          Cache id
	 * @return boolean true if no problem
	 */
	protected function _unset($id)
	{
		return zend_disk_cache_delete($this->_options['namespace'] . '::' . $id);
	}

	/**
	 * Clear cache
	 */
	protected function _clear()
	{
		zend_disk_cache_clear($this->_options['namespace']);
	}
}
